Huang Z.-F., Song J., Li K. et al. · Journal of the American Chemical Society · 2016 · 1359-1365
Open a family to keep every result attached to its sample, method and conditions.
Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.
Zn0.30Co2.70S4 functions as an efficient HER electrocatalyst across pH 0-14.
Caveat: Reported as catalyst-film performance at a fixed loading, not intrinsic site-normalised activity.
1364 · 3.5 · Figure 7; Table S4 · Linked to 5 structured results
Zn0.30Co2.70S4 is an effective photocatalytic HER cocatalyst, giving rates close to Pt/C or photodeposited Pt in dye-sensitised and semiconductor systems.
Caveat: Photocatalytic rates are application-specific and depend on light intensity, sensitiser/semiconductor, and catalyst loading.
1364 · 3.6 · Figure 7e,f · Linked to 6 structured results
The bimetallic MCo-MOF precursors are homogeneous mixed-metal frameworks rather than mixtures of separate monometallic MOFs.
Caveat: Single-crystal structures are not supplied; assignment relies on powder XRD, composition and colour/SEM evidence.
1361 · 3.1 · Figure 1; Tables S1-S3 · Linked to 4 structured results
The derived MxCo3-xS4 products retain a cubic Co3S4 spinel structure with homogeneous second-metal incorporation and no separate metal-sulphide peaks.
Caveat: No CIF/refined occupancy data provided; phase assignment is by powder XRD/EELS/XPS evidence.
1361 · 3.2 · Figures 2-3; Table S3 · Linked to 2 structured results
Homogeneous Zn incorporation plus hollow morphology substantially improves HER activity relative to pristine Co3S4.
Caveat: Catalytic activity is an application metric; direct four-probe electrical conductivity was not measured.
1362-1363 · 3.3 · Figure 5; Figure S13 · Linked to 5 structured results
S2- from TAA first forms a sulphide shell on the MOF surface; faster outward metal-ion diffusion than inward sulphide diffusion produces a hollow void.
Caveat: Mechanism is inferred from time-dependent microscopy/EELS rather than direct in situ observation.
1362 · 3.2 · Figure 4 · Linked to 2 structured results
Second-metal doping improves electrochemical transport by lowering charge-transfer resistance and narrowing the calculated band gap.
Caveat: Conductivity is inferred from EIS and DFT band-gap trends; no direct bulk conductivity value is reported.
1363 · 3.4 · Figure 6; Figure S13b · Linked to 6 structured results
Zn-doped Co3S4 gives the best HER balance because it combines improved conductivity with a more moderate H adsorption free energy than pristine, Ni-doped, or Cu-doped Co3S4.
Caveat: DFT model surface and experimental nanoparticle surfaces may not be identical.
1363 · 3.4 · Figure 6c · Linked to 5 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Graphitic carbon nitride semiconductor | C3N4 | unknown · PristineC3N4 semiconductor made by calcining urea. | 1360 · 2.5. Photocatalytic HER |
| Hollow Co3S4 polyhedra | Co3S4Co | 0D · DerivedCubic Co3S4 spinel hollow polyhedra derived from Co-MOF. | 1361-1362 · 3.2. Formation of Homogenous Bimetallic Cobalt Sulfides · Figures 3 and 4 |
| Co-MOF (ZIF-67)Browse family: ZIF-67 / Co(mIm)₂ | Co(2-methylimidazolate) frameworkCo2+ · 2-methylimidazole | 3D · PristineZIF-67-type Co-MOF precursor; purple rhombic dodecahedral polyhedra. | S4 · 1. Experimental |
| MCo-MOF mixed-metal ZIF precursor | MCo-MOF, M = Zn, Ni, CuCo2+ plus Zn2+, Ni2+, or Cu2+ · 2-methylimidazole | 3D · PristineBimetallic MOFs with XRD peaks at positions similar to Co-MOF; M2+ substitutes Co2+ sites. | 1360-1361 · 3.1. Formation of Homogenous Bimetallic MOFs · Figure 1; Tables S1-S3 |
| Hollow Co-based bimetallic sulphide polyhedra | MxCo3-xS4 (M = Zn, Ni, Cu)Co with Zn, Ni, or Cu dopants in spinel cobalt sulphide | 0D · DerivedHollow rhombic dodecahedral spinel-type sulphide polyhedra indexed as cubic Co3S4 with homogeneous second-metal incorporation. | 1361 · 3.2. Formation of Homogenous Bimetallic Cobalt Sulfides · Figures 2-3 |
| Commercial Pt/C reference catalyst | Pt/C, 20 wt % PtPt | unknown · CompositeCommercial reference catalyst. | 1362 · 3.3. Superior Electrocatalytic Performance in Acidic Media · Figure 5 |
| TiO2 semiconductor | TiO2Ti | unknown · PristineDegussa/Hulls TiO2 semiconductor used in photocatalytic HER. | 1360 · 2.5. Photocatalytic HER |
| ZnS control | ZnSZn | 0D · DerivedZnS control produced from Zn-MOF; negligible HER activity. | 1363 · 3.3. Superior Electrocatalytic Performance in Acidic Media · Figure S7c |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| C3N4research_0426__mat__mat_c3n4 | Powder · Pristine Control · Pristine Framework | urea-calcined carbon nitride semiconductor | 1360 · 2.5. Photocatalytic HER |
| hollow Co3S4research_0426__mat__mat_co3s4 | Powder · Pristine Control · Pristine Framework | MOF-derived hollow sulphide after solvothermal sulphidation and N2 annealingshell ca. 30-50 nm | 1361 · 3.2. Formation of Homogenous Bimetallic Cobalt Sulfides · Figures 3 and 4 |
| Co3S4(001) DFT slabresearch_0426__mat__mat_co3s4 | Model · Model System · Model | symmetric nonstoichiometric (001) slab model | S5-S6 · 2. Computation · Scheme S1 |
| Co-MOF (ZIF-67)research_0426__mat__mat_co_mof | Powder · Pristine Control · Pristine Framework | as-synthesised MOF precursor | S4 · 1. Experimental |
| Cu0.30Co2.70-MOFresearch_0426__mat__mat_mco_mof | Powder · Target Sample · Mixed Metal | as-synthesised mixed-metal MOF precursor | S4 · 1. Experimental |
| Cu0.30Co2.70S4research_0426__mat__mat_mxco3xs4 | Powder · Target Sample · Doped | MOF-derived hollow bimetallic sulphide | 1362 · 3.3. Superior Electrocatalytic Performance in Acidic Media · Figure 5a |
| Cu-doped Co3S4 DFT modelresearch_0426__mat__mat_mxco3xs4 | Model · Model System · Model | Co2+ atoms replaced by Cu in Co3S4 bulk/slab | S5-S6 · 2. Computation · Scheme S1 |
| milled Zn0.30Co2.70S4 powderresearch_0426__mat__mat_mxco3xs4 | Powder · Target Sample · Doped | hollow polyhedra converted into powders by ball milling | 1363 · 3.3. Superior Electrocatalytic Performance in Acidic Media · Figure S12 |
| Ni0.30Co2.70-MOFresearch_0426__mat__mat_mco_mof | Powder · Target Sample · Mixed Metal | as-synthesised mixed-metal MOF precursor | S4 · 1. Experimental |
| Ni0.30Co2.70S4research_0426__mat__mat_mxco3xs4 | Powder · Target Sample · Doped | MOF-derived hollow bimetallic sulphide | 1362 · 3.3. Superior Electrocatalytic Performance in Acidic Media · Figure 5a |
| Ni-doped Co3S4 DFT modelresearch_0426__mat__mat_mxco3xs4 | Model · Model System · Model | Co2+ atoms replaced by Ni in Co3S4 bulk/slab | S5-S6 · 2. Computation · Scheme S1 |
| Pt/C referenceresearch_0426__mat__mat_ptc | Powder · Pristine Control · Composite | commercial 20 wt % Pt/C catalyst film or photocatalytic referenceglassy carbon electrode for electrochemistry | 1362 · 3.3. Superior Electrocatalytic Performance in Acidic Media · Figure 5 |
| TiO2research_0426__mat__mat_tio2 | Powder · Pristine Control · Pristine Framework | commercial TiO2 semiconductor | 1360 · 2.5. Photocatalytic HER |
| Zn0.15Co2.85-MOFresearch_0426__mat__mat_mco_mof | Powder · Target Sample · Mixed Metal | as-synthesised mixed-metal MOF precursor | S4 · 1. Experimental |
| Zn0.15Co2.85S4research_0426__mat__mat_mxco3xs4 | Powder · Target Sample · Doped | MOF-derived hollow bimetallic sulphide | S27 · Table S3 · Table S3 |
| Zn0.30Co2.70S4-C3N4 photocatalytic mixtureresearch_0426__mat__mat_mxco3xs4 | Powder · Composite Sample · Composite | photocatalytic reaction mixture under visible light | 1360 · 2.5. Photocatalytic HER · Figure 7f |
| Zn0.30Co2.70S4-TiO2 photocatalytic mixtureresearch_0426__mat__mat_mxco3xs4 | Powder · Composite Sample · Composite | photocatalytic reaction mixture under UV light | 1360 · 2.5. Photocatalytic HER · Figure 7f |
| Zn0.30Co2.70-MOFresearch_0426__mat__mat_mco_mof | Powder · Target Sample · Mixed Metal | as-synthesised mixed-metal MOF precursor | S4 · 1. Experimental |
| hollow Zn0.30Co2.70S4research_0426__mat__mat_mxco3xs4 | Powder · Target Sample · Doped | MOF-derived hollow bimetallic sulphide after solvothermal sulphidation and N2 annealingshell ca. 30-50 nm | 1359 · Abstract |
| Zn0.45Co2.55-MOFresearch_0426__mat__mat_mco_mof | Powder · Target Sample · Mixed Metal | as-synthesised mixed-metal MOF precursor | S4 · 1. Experimental |
| Zn0.45Co2.55S4research_0426__mat__mat_mxco3xs4 | Powder · Target Sample · Doped | MOF-derived hollow bimetallic sulphide | S27 · Table S3 · Table S3 |
| Zn-doped Co3S4 DFT modelresearch_0426__mat__mat_mxco3xs4 | Model · Model System · Model | Co2+ atoms replaced by Zn in Co3S4 bulk/slab | S5-S6 · 2. Computation · Scheme S1 |
| Zn-MOFresearch_0426__mat__mat_mco_mof | Powder · Pristine Control · Pristine Framework | as-synthesised Zn-only MOF comparator | 1361 · 3.1. Formation of Homogenous Bimetallic MOFs · Figure S3 |
| ZnS electrode controlresearch_0426__mat__mat_zns | Powder · Pristine Control · Pristine Framework | ZnS control tested as electrode | S14 · Figure S7 · Figure S7 |